Thermophore Moisture-Plus™ Cover - Medium/Joint
Size/Application: For very dry environments.
The Moisture-Plus Cover fits over the Thermophore Pack like the flannel cover does, but is designed so moisture can be added in the form of a damp cloth (not included). The heating unit is protected by a rubberized cover and the damp cloth is placed in a separate sleeve. The Moisture-Plus Cover will enable your Thermophore Pack to operate at its peak efficiency, independent of atmospheric moisture conditions. New, non-shrinkable 'flannel' cover, made of cotton/fleece.
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http://www.medwing.com/product/thermophore-moisture-plus-cover-mediumjoint